DTrace support, with a small initial set of probes

by Robert Lor

src/include/pg_trace.h

@@ -0,0 +1,56 @@
+/* ----------
+ *	pg_trace.h
+ *
+ *	Definitions for the PostgreSQL tracing framework
+ *
+ *	Copyright (c) 2006, PostgreSQL Global Development Group
+ *
+ *	$PostgreSQL: pgsql/src/include/pg_trace.h,v 1.1 2006/07/24 16:32:45 petere Exp $
+ * ----------
+ */
+
+#ifndef PG_TRACE_H
+#define PG_TRACE_H
+
+#ifdef ENABLE_DTRACE
+
+#include <sys/sdt.h>
+
+/*
+ * The PG_TRACE macros are mapped to the appropriate macros used by DTrace.
+ *
+ * Only one DTrace provider called "postgresql" will be used for PostgreSQL,
+ * so the name is hard-coded here to avoid having to specify it in the
+ * source code. 
+ */
+
+#define PG_TRACE(name) \
+	DTRACE_PROBE(postgresql, name)
+#define PG_TRACE1(name, arg1) \
+	DTRACE_PROBE1(postgresql, name, arg1)
+#define PG_TRACE2(name, arg1, arg2) \
+	DTRACE_PROBE2(postgresql, name, arg1, arg2)
+#define PG_TRACE3(name, arg1, arg2, arg3) \
+	DTRACE_PROBE3(postgresql, name, arg1, arg2, arg3)
+#define PG_TRACE4(name, arg1, arg2, arg3, arg4) \
+	DTRACE_PROBE4(postgresql, name, arg1, arg2, arg3, arg4)
+#define PG_TRACE5(name, arg1, arg2, arg3, arg4, arg5) \
+	DTRACE_PROBE5(postgresql, name, arg1, arg2, arg3, arg4, arg5)
+
+#else /* not ENABLE_DTRACE */
+
+/*
+ * Unless DTrace is explicitly enabled with --enable-dtrace, the PG_TRACE
+ * macros will expand to no-ops.
+ */
+
+#define PG_TRACE(name)
+#define PG_TRACE1(name, arg1)
+#define PG_TRACE2(name, arg1, arg2)
+#define PG_TRACE3(name, arg1, arg2, arg3)
+#define PG_TRACE4(name, arg1, arg2, arg3, arg4)
+#define PG_TRACE5(name, arg1, arg2, arg3, arg4, arg5)
+
+#endif /* not ENABLE_DTRACE */
+
+#endif /* PG_TRACE_H */